NE05A-A Dia. 25 mm AR-Coated Absorptive Neutral Density Filter; SM1-Threaded Mount; 350-700nm; OD 0.5 AR 350-700nm

The NE05A-A is a Neutral Density Filter, part of the extensive catalog of optical elements offered by Thorlabs. This absorptive filter, with a diameter of 25 mm and a thickness of 0.9 mm, is designed for use in the visible light spectrum, specifically at a wavelength of 633 nm.

The filter features an SM1-threaded mount, a common thread size in Thorlabs' optomechanical components, which ensures compatibility and ease of integration with other components in your system.

The NE05A-A boasts anti-reflection coatings on both the front and back surfaces, specifically designed for the 350-700 nm range. This coating, denoted as 'tho ne05a-a', reduces surface reflections, thereby increasing transmission and minimizing back-reflections that could lead to unwanted interference or loss of signal in your system.

The filter's neutral density reduces the intensity of all wavelengths of light equally, making it an ideal choice for applications where light intensity needs to be controlled without altering the color composition. The filter's optical density (OD) is 0.5, meaning it reduces the light intensity to approximately 32% of the incident light.